133851 has 4 divisors (see below), whose sum is σ = 178472. Its totient is φ = 89232.

The previous prime is 133843. The next prime is 133853. The reversal of 133851 is 158331.

It is a happy number.

133851 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 133851 - 2³ = 133843 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22306 + ... + 22311.

It is an arithmetic number, because the mean of its divisors is an integer number (44618).

2¹³³⁸⁵¹ is an apocalyptic number.

133851 is a deficient number, since it is larger than the sum of its proper divisors (44621).

133851 is an equidigital number, since it uses as much as digits as its factorization.

133851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44620.

The product of its digits is 360, while the sum is 21.

The square root of 133851 is about 365.8565292570. The cubic root of 133851 is about 51.1533255875.

The spelling of 133851 in words is "one hundred thirty-three thousand, eight hundred fifty-one".